用户指南和参考

ST_GeometryType

ST_GeometryType 接受 ST_Geometry 对象并以字符串形式返回它的几何图形类型。

语法

db2gse.ST_GeometryType (g db2gse.ST_Geometry)

返回类型

Varchar(4000)

示例

GEOMETRYTYPE_TEST 表包含 G1 几何图形列。

CREATE TABLE GEOMETRYTYPE_TEST(g1 db2gse.ST_Geometry)

下列 INSERT 语句将每个几何图形子类插入 G1 列。

INSERT INTO GEOMETRYTYPE_TEST
VALUES(db2gse.ST_GeometryFromText('point (10.02 20.01)', db2gse.coordref()..srid(0)))
 
INSERT INTO GEOMETRYTYPE_TEST
VALUES (db2gse.ST_GeometryFromText('linestring (10.01 20.01, 10.01 30.01, 10.01 40.01)',
                         db2gse.coordref()..srid(0)))
 
INSERT INTO GEOMETRYTYPE_TEST
VALUES(db2gse.ST_Geometrytype_test values(db2gse.ST_GeomFromText('polygon ((10.02
20.01,11.92 35.64,25.02 34.15,19.15 33.94, 10.02 20.01))',
                        db2gse.coordref()..srid(0))))
 
INSERT INTO GEOMETRYTYPE_TEST
VALUES(db2gse.ST_GeometryFromText('multipoint (10.02
 20.01,10.32 23.98,11.92 25.64)',
                        db2gse.coordref()..srid(0)))
 
INSERT INTO GEOMETRYTYPE_TEST
VALUES(db2gse.ST_GeometryFromText('multilinestring ((10.02 20.01,10.32 23.98,
                                           11.92 25.64),
                                       (9.55 23.75,15.36 30.11))',
                        db2gse.coordref()..srid(0)))
 
INSERT INTO GEOMETRYTYPE_TEST
VALUES(db2gse.ST_GeometryFromText('multipolygon (((10.02 20.01,11.92 35.64,25.02 34.15,
                                         19.15 33.94,10.02 20.01)),
                                       ((51.71 21.73,73.36 27.04,71.52 32.87,
                                         52.43 31.90,51.71 21.73)))',
                        db2gse.coordref()..srid(0)))

下列 SELECT 语句列示 G1 几何图形列中存储的每个子类的几何图形类型。

SELECT db2gse.ST_GeometryType(g1) "Geometry type" FROM GEOMETRYTYPE_TEST

返回下列结果集。

Geometry type
--------------------------------
ST_Point
ST_LineString
ST_Polygon
ST_MultiPoint
ST_MultiLineString
ST_MultiPolygon
 
6 record(s) selected.


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